Activated carbon will work for the discolorization. At least it works on the tannins from peat filtered water. I used to do a water change on my dosing day to clear up any driftwood discoloration versus carbon filtration.
I would say your best bet is to do a serious water change and maybe use activated carbon for a short time just until the tanks clears up.But you can have a problem if the drift continues putting tannis in the water colum.Utraviolet Sterilizers would work well in this situation.
The carbon may remove trace elements, which is why I do water changes. You can always add more trace elements to try and account for what the carbon removes. Either way...water change or carbon...you are going to remove the trace elements.
When I had this problem I was doing 50% water changes up to 3x a week, on my macro dosing days. It took a couple of weeks but the driftwood eventually leaked its tannins into the water.